Wildcat trail system should be open soon. There are supposedly some in the Daniels park area, although I drove up there to check it out and didn't see any. I think there is something at Surrey Ridge? I have taken my dogs to the dog park there and seen people riding along the ridge above but have not checked it out yet. That is located along the east side of 25 between HR and CR. I am pretty sure there are some good trails in the Castle Rock area too. Look at the trail review section and sort by towns.
Let us know if you find anything good, because I am always looking for something like that.

Hidden Mesa is a nice trail in Parker. If you are on Parker Road I think it is about 6 miles south of Main Street. There can be some horses on the trail but it is a fun ride. Nothing to strenuous as there is only one small climb but does have a small area of some technical riding.